coal mining


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Related to coal mining: Underground coal mining

coal mining,

physical extraction of coal resources to yield coal; also, the business of exploring for, developing, mining, and transporting coal in any form. Strip mining is the process in which the overburden (earth and rock material overlying the coal) is removed to expose a coal seam or coal bed. Excavators either dispose of the overburden or store the waste material for replacement after the coal has been extracted. Once exposed, the coal is usually removed in a separate operation. Surface soil is often stripped separately and spread back onto the reclaimed surface. The environment can also be protected by seeding or planting grass or trees on the fertilized restored surface of a strip mine. The term strip mining is most often used in reference to coal mining, although the process may also be used to extract certain metallic ores as well. Sometimes the terms open-pit, open-cast, or surface mining are used in the same sense, although they usually refer to metalliferous mining or the mining of other minerals. Underground coal mining is the extraction of coal from below the surface of the earth. The coal is worked through tunnels, passages, and openings that are connected to the surface for the purpose of the removal of the coal. Mechanical equipment breaks the coal to a size suitable for haulage. Alternatively, the coal is drilled, and the resultant holes are loaded with explosives and blasted in order to break the coal to the desired size. In order to protect the miners and equipment in an underground coal mine, much attention is paid to maintaining and supporting a safe roof or overhead ceiling for the extraction openings. Long-wall mining is a method of underground mining believed to have been developed in Shropshire, England, near the end of the 17th cent. A long face, or working section, of coal, some 600 ft (180 m) in length, is operated at one time. The miners and machinery at the working face are usually protected by hydraulic jacks or mechanical props which are advanced as the coal is extracted. The excavated, or gob, area is either allowed to cave in, or is filled in by waste material called stowing. The Anderton shearer is a widely used coal cutter and loader for long-wall mining. It shears coal from the face as it moves in one direction and loads coal onto an armored conveyor as it travels back in the opposite direction. It is ordinarily used for coal seams greater than 3.5 ft (9.1 cm) in thickness.

coal mining

[′kōl ‚mīn·iŋ]
(mining engineering)
The technical and mechanical job of removing coal from the earth and preparing it for market.
References in periodicals archive ?
From 1 December 2015, under commercial licensing terms, the Coal Authority will be making available their coal mining data.The Coal Authority is pleased to announce that from 1 December 2015, under commercial licensing terms, it will be making available its coal mining data to external parties.
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The tribunal in its latest order has observed, "We further direct the chief secretary and secretary, mining &Geology of the state of Meghalaya to take up the matter with Secretary, Union Ministry of Ministry of Environment and Forests (MoEF) and secretary Coal Government of India and finalise the coal mining plan in the state at the earliest, the law which ought to have complied with before carrying on the mining activity and the manner in which the mining activity, if at all could be permitted in the state of Meghalaya."
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The Coal Authority has the responsibility for the management and remediation of environmental impacts created by past coal mining activities undertaken throughout the United Kingdom.
In February 2011, Lanco Infratech through its Australian subsidiary, Lanco Resources Australia, had acquired Griffin Coal Mining Company and Carpenter Mine Management for AUD 720 million.
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The government should implement Occupational Safety and Health Situation (OSHS) to overcome the accidents which occur in coal mining.
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It does not mean a decline in coal mining in Slovakia, the organisation claimed in its press release.
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announced Yanzhou Coal Mining Company Ltd., a China-based coal mining company, has qualified to have its American Depositary Receipts (ADRs) trade on the OTCQX(r) Best Market.